2006 cr250r????

[jimmy 2006]

just wondering if anyone can recommend a mechanic in auckland that really understands jetting issues? my mates kx250 (o5) is having the same issues at the moment. i took my old kx125 into mt eden motorcycles and they could not get the jetting right. so preferably someone else.... i don't understand how to fix it myself otherwise i would.

[Pierce]

I don't know if the 06 jetting will work in the 04 as I think the 05 on had a different engine or managment system? But would be interesting to see. But you have been running the same jetting in winter and summer Sam? If thats the case it is not optimal.

Yeah I think the power valves were different from 05 and the carb too?

BOOM that would be fantastic mate! I took it for a good blast last night and it seemed to run a heap better just changing out the plug. I think I will whip the top of the carb tonight and see what it's set at and take it from there because I believe it is still running a wee bit too rich.

SO 40:1 iswhat you're running? I'm in HAmilton and riding Kimmy's quite a lot so I can't imagine it'd be too much different.

[Danger]

All my 250's have been run at 40:1 for MX but my RM which is used for off road is now run at 50:1.

[jimmy 2006]

All my 250's have been run at 40:1 for MX but my RM which is used for off road is now run at 50:1.

the kx250 that my mate has is still got the same stock jetting. can we just change from 40:1 to 50:1 or do we need to re jet it? will it risk seizing if it is run at 50:1 for bush (riverhead) and novice MX??

[Danger]

Dropping the oil ratio from 40:1 to 50:1 will actually make the bike run richer. The oil in the fuel slows the fuel though the jets so when you remove oil the fuel travels faster through the jets. Layman's way of looking at it but thats how it works. Less oil, more fuel. More oil, less fuel. So no it won't seize, but it will run richer making things worse unless you address the rich condition. But the difference between 40:1 and 50:1 might only be a half clip position on the needle (if the bike was jetted right in the first place). Most bikes come with a couple of different needles, one of which is a half clip leaner than the other if using the same clip position. Hope you can understand that but check the manual if unsure.

Funny thing is I have an 05 KX250 in the workshop at the moment and it is pumping oil out and running rich. But the customer has not asked me to fix this (and I tend to steer away from jetting bikes other than my own as it can be time consuming getting it right) he just replaces plugs all the time. I'm not sure if its stock (probably) or not and he is a novice so really does not burn off the oil. And from memory I think he told me he used 32:1 but is going to change after talking to me.

Can you tell me what the stock jetting is in the KX250? I can then pass the info on to the customer.

[B0000M]

yea ive been running the same jetting year round, allthough ive only ridden a couple of times in hot weather. probably not optimal jetting i know, but it does run well and smooth thru the revrange and doesnt foul plug - if nothing else its a good starting point for others with completely screwed up jetting settings.

im not doing it tonite tho too tired

[crazyxr250rider]

At 50:1, you simply can't jet very lean without risking a seized engine due to oil starvation.

With the high oil concentrations that I use, I tend to get far more life from my cranks and rings than most of my friends that run leaner oil ratios. The high oil content also produces better ring sealing, so more of the combustion pressure is retained.

One small point. No one ever broke an engine by using too much oil.

.

I bet the the previous owner thought 50:1 was "all good"

[jimmy 2006]

Dropping the oil ratio from 40:1 to 50:1 will actually make the bike run richer. The oil in the fuel slows the fuel though the jets so when you remove oil the fuel travels faster through the jets. Layman's way of looking at it but thats how it works. Less oil, more fuel. More oil, less fuel. So no it won't seize, but it will run richer making things worse unless you address the rich condition. But the difference between 40:1 and 50:1 might only be a half clip position on the needle (if the bike was jetted right in the first place). Most bikes come with a couple of different needles, one of which is a half clip leaner than the other if using the same clip position. Hope you can understand that but check the manual if unsure.

Funny thing is I have an 05 KX250 in the workshop at the moment and it is pumping oil out and running rich. But the customer has not asked me to fix this (and I tend to steer away from jetting bikes other than my own as it can be time consuming getting it right) he just replaces plugs all the time. I'm not sure if its stock (probably) or not and he is a novice so really does not burn off the oil. And from memory I think he told me he used 32:1 but is going to change after talking to me.

Can you tell me what the stock jetting is in the KX250? I can then pass the info on to the customer.

sorry mate, no idea what the stock jetting is. where abouts do you work? any chance of dropping by with this kx to see if you can sort it out????

[Danger]

Sorry Jimmy, jetting is something I prefer not to get into. Its time consuming to be sure that you have it right, noisy and I have enough on my plate.
Perhaps Scott might have some settings that can get you started.

[dammad1]

sorry mate, no idea what the stock jetting is. where abouts do you work? any chance of dropping by with this kx to see if you can sort it out????

Just give it a go yourself its not that difficult, i've been playing with mine lately and it is quite amazing the difference small changes can make to the performance. Mine was running quite rich from the shop I raised the clip position one clip the other day and it made a huge difference to the midrange power.

[scott411]

i can;t be assed reading though everything and finidng out the year of the bike

pm me with the year, and model of the bike, and i will tell you the std jetting, and any team green jetting specs id i have them

Danger is right, jetting a bike is very hard to do in a workshop enviroment as you can not put the bike under load, (have it pulling hard, ie up a hill)

it is a trail and error thing, as most 2 strokes can vary a little bit betweem each bike,

[Danger]

Std and Team Green specs for an 05 KX250 would be useful for my customer and for Jimmy's mate thanks Scott.

[scott411]

std
160 Main
50 PIlot
NFTG Needle

Team Green Specs
still working on these, tomorrow hopefully

[scott411]

team green specs,
165 main
52 pilot
std needle

[jimmy 2006]

Just give it a go yourself its not that difficult, i've been playing with mine lately and it is quite amazing the difference small changes can make to the performance. Mine was running quite rich from the shop I raised the clip position one clip the other day and it made a huge difference to the midrange power.

wow! you use the mid range power